Powder Flame Spray for Ceramics
08-03-2011, 01:01 PM, (This post was last modified: 09-19-2011, 06:58 PM by Met.Eng..)
#1
Powder Flame Spray for Ceramics
Hi SEF members,

We want to do some ceramics coatings with 6P-II (acetylene fuel) for economic reasons instead of plasma gun. Especially, we want to try fine chromium oxide (ex Metco 6156) coatings .

Our Trials could not get a result like glassy surface of ceramic coating. I saw the flow of sludge ceramics during grinding. Is there any body work with Cr2O3 or smtg else like high meltin point powders with 6P-II gun?

Why cant we get a glassy ceramic surface structure. Is there anything we should be careful about the spray parameters? For ex O2:36 C2H2:21 Ar:5 Air:1,1 Bar (for Cooling gun),.....

What is your advice on ceramic tiles with 6P-II gun?

Good day...
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08-03-2011, 02:33 PM,
#2
RE: Powder Flame Spray for Ceramics
Hi Metallurgy_eng

Are you using air jet assembly 6P330 with cross jet intersect at 65mm with 4.5 bar air pressure and spray distance 75mm (10mm beyond air jet intersect point). If not that will explain very poor coating.

Quote:We want to do some ceramics coatings with 6P-II (acetylene fuel) for economic reasons instead of plasma gun.

Well if you do not have a plasma system then fair enough Big Grin good reason. If you do then economics is not so clear cut. Chromium oxide has very poor deposit efficiency at the best of times, but with flame spray you may only be looking at ~20%, plasma would be more than double that, with better quality and much higher productivity.
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08-03-2011, 06:45 PM,
#3
RE: Powder Flame Spray for Ceramics
Hi Metallurgy_eng,
I have also carried out ceramic coatings using both flame spray as well as plasma spray. I am convinced that only plasma spray and only plasma spray will give you the real coating properties for witch ceramics are meant. By spraying ceramics by flame spray we are gaining on short term to loose on long term
Regards
Vijay Deshpande

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08-04-2011, 10:15 AM, (This post was last modified: 08-04-2011, 10:16 AM by Met.Eng..)
#4
RE: Powder Flame Spray for Ceramics
I'm doing a comparison of the two systems produced coatings. Our Coatings produced in the plasma, we obtain a surface of the glassy and shinny after grinding. However, powder flame system, we obtain a more matte finish and disperse powdered form. May be the melting of powder isnt enough on powders flame spray? isnt it? But when I look at the catalog, we can coat the powder flame with ceramics. How do you do about coating pricing with powder and plasma_?
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08-04-2011, 11:13 AM,
#5
RE: Powder Flame Spray for Ceramics
Hi Metallurgy_eng

Are you using air jet assembly 6P330?
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08-04-2011, 11:51 AM, (This post was last modified: 08-04-2011, 11:56 AM by Met.Eng..)
#6
RE: Powder Flame Spray for Ceramics
Hi gordon

I did not see being used. May be the problem stems from it. Frankly I do not know.Do you think it is much of a difference?




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08-04-2011, 12:12 PM,
#7
RE: Powder Flame Spray for Ceramics
Hi Metallurgy_eng

Yes, it will be big problem if not used.
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08-04-2011, 12:52 PM,
#8
RE: Powder Flame Spray for Ceramics
Thank you for helping
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09-19-2011, 04:15 PM,
#9
RE: Powder Flame Spray for Ceramics
Original image by Metallurgy_eng

   
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09-19-2011, 04:46 PM,
#10
RE: Powder Flame Spray for Ceramics
Hi Metallurgy_eng

Yes, the air jet set-up looks correct in the image you supplied in the above post.

Really, the only other consideration is the air jet orientation with respect to gun and substrate movement. Most seem to just set them in the horizontal plane, but I think it would be worth experimenting with for your particular application.

Something I didn't realise or remember - there is two sets of air nozzles - 6P 30 for flat surfaces and 6P 335 for cylindrical surfaces. I don't know what the differences are.


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